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Патент USA US2406541

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‘?Allg- 27, 1946- I
‘ ' 2,4065“
Filed March 28, 1944
~ ' '
Patented Aug. 27, 1946
Allen M. Hewlett, Haina, Hamakua,
Territory of Hawaii‘
Application March 28, 1944, Serial No. 528,398
10 Claims.
(Cl. 100-47)
The present invention relates to cane mills of
the type in which a layer or blanket of the cane
is fed between superposed rollers, and the in
roller I2 where the juice is extracted, and then
over a guide I9 and through the smaller opening
vention relates more particularly to the means
employed for facilitating the feed of sugarcane
to the rollers and for assisting the drag of the
l5 between the upper roller l0 and the second
lower roller I3 for additional juice extraction.
The rollers Ill, l2 and 13 may be supported in
slidable bearings to permit adjustments of the
relative peripheral positions of these rollers in a
manner well-known in the art, and are driven at
the same peripheral speed, as for example, by
If the sugar cane blanket is too bulky, mill
choke and slippage occurs and. the capacity of
the mill is reduced, and various means have been 10 means of the gearing I6.
For compacting the sugar cane before it enters
proposed to facilitate the feed of the blanket.
the nip region of the rollers l0 and I2, there is
One object of the present invention is to pro
provided in accordance With certain features of
vide new and improved means for easing the feed
the present invention a, compressing member 20
of sugar cane into the mill rolls, and for prevent
15 in front of the upper roller l0‘ pendulously sup
ing mill choke and slippage.
ported for free swinging movement and recipro
In carrying out certain features of the present
cated up and down to compress, compact andde
invention,v a compressing member carried by a
press the cane blanket as it is fed to the rollers.‘
pendulous support, is reciprocably actuated into
This compressing member 20 is desirably in the
position to precompress the cane blanket While
travelling with said blanket towards the mill 20 form of a substantially horizontal bar extending
transversely with respect to the direction of feed
opening. On each vreturn stroke, the compress
' of the cane blanket, and is shown as a wooden
ing member swings away from the nip of the roll
beam which’may be about 2.’ "or 3" x 4" in cross
ers in preparation for the next compression stroke.
section, depending on the particular installation.
This precompressing operation reduces the thick
ness of the feed blanket andat the same time, 25 The pendulous support for the compression
member 20 desirably comprises a pair of connect-.
keeps it depressed below a certain level within
ing rods 2| freely suspended at their upper ends
the limits of the “angle of nip”, to render said
from respective cranks 22 ?xed to a crank shaft
blanket more acceptable to the mill rollers. This
23, and connected at their lower ends to the com
operation prevents mill choke and slippage, and
30 pression bar 26, as for example, by bolts 24 pass
increases the capacity of the mill.
ing through extensions 25 on said rods. The
Various other objects, features and advantages
crank shaft 23 is supported at the upper end of
of the invention will be apparent from the fol
the machine on bearings or pillow blocks 26 ?xed '
lowing particular description, and from an in
to ‘the frame structure of the machine in any
spection of the accompanying drawing, in which:
Fig. 1 is an end elevation somewhat diagram 35 suitable manner. For example, an angle bracket
forsupporting each of the bearings 26 has one
matic of a sugar mill embodying the present in
leg 28 seated on the mill cheek cap 30 of the
upper roller I 0, and held thereto by the king bolt
Fig. 2 is airont elevation of the mill, the feed
3!, while the other depending leg 32 has the cor
ing means being omitted; and
responding bearing 26 bolted or otherwise secured‘
Fig. 3 is a diagram showing the operational
movement of the compressing member of the
The crank shaft 23 is desirably driven in the
present invention.
same direction as the upper roller ID, as for ex
The present invention is shown applied to an
ample, by a drive chain 33 passing over sprocket
extraction mill of the well-known 3-roller type
comprising an upper roller l0 supported in a pair 115 wheels 34 and 35 connected to and coaxial with‘
the upper roller It and the crank shaft 23 re-,
of spaced end frame pieces II, and a, pair of
spectively. The feed conveyor to the mill may
lower rollers l2 and I3-also supported in said
also be driven from ‘the roller ID from a sprocket
frame pieces and peripherally spaced from said
wheel 36 on’the shaft of said roller.
upper roller. The sugar cane to be ground and
compressed may, for example, be delivered in the 50 - In the operation of thedevice-described, as the
crank shaft 23 is rotated, the compression bar 20
form of a, blanket along a. trough .l ‘I to the mill by
a conveyor I8 from a crusher which prepares the
. is reciprocated up and down through connecting
cane by shredding and crushing. This prepared
rods 2 I . During the downward stroke of the con
necting rods 2|, the compression bar '20 forces
cane or bagasse ?rst passes through the opening
I4 between the upper roller I0 and the ?rst lower 55 the cane- blanket downwardly'towards the ‘roller
12. As the cane blanket is drawn in between the
pact and thinner blanket, but also depresses this
blanket towards the bottom mill roller [2, so that
two rollers I I] and I2, the connecting rods 2| .
being freely suspended from crank pins, swing
the upper surface of the blanket lies below a hori
towards the upper roll It), so that the compres
sion bar 20 follows said blanket towards the ?rst
mill opening l4 ‘while maintaining said blanket
under compression. . The
zontal plane through the center of the axis of the
upper roller l0, thereby rendering the blanket
more acceptable to the mill. In other words, the
blanket is depressed and restrained within the’
limits of the “angleof nip” of the mill.
The mechanism of the‘ present invention is sim
compression mecha
nism is desirably so designed that the bottom of
the compression bar 20 clears the surface of the
bottom roller I2 by about 4 to 6 inches in down
ward limiting position of said bar.
10 ple and inexpensive to manufacture, can be readi
ly installed in existing mills without any substan
tial reconstruction of these mills, and can be also
During the upward stroke of the connecting "
rods 2|, the bar 26 is/lifted out of engagement .
readily removed. The mechanism is also such as
to permit the use of light parts without the dan
with the cane blanket,‘ and may slide up on the
surface‘of the roller l0 and then be carried away 15 ger of. breakage and requires no separate driving
from it, so that upon the next downward stroke '
The speed of the mechanism automati
cally varies with the speed of’ the mill, maintain
on the blanket at some distance from said top
ing a constant relative speed determined by vthe
roller to again compress the blanket, as indicated
ratio of sprocket 34 to sprocket 35.
diagrammatically in Fig. 3. If the blanket be 20
Although the invention is shown applied to a
very thiclethe bar may not leave it on the up
mill following the crusher "which prepares the.
' 'motor.
of said connecting rods, the bar 26 will be dropped ' '
movement and in that case the lower range of
sugar cane by shredding or crushing, as far as
movement may be mainly up and down along the
certain aspects of the invention are. concerned,
the invention can also be applied to a crusher of e
' surface ofthe roller l0.
From the moment the cranks t2 reach the mid
point 'of their downward. stroke, the horizontal
components of the motion of their ‘crank pins is
towards the roller i 0. Thus, the compression bar
23 is aided‘ in its travel with the flow of the feed
blanket, upon which it is pressing, and aids in
pushing the blanket towards the mill opening l4.
When the feed to the mill is too great, the sugar
cane will. tend to pile upbehind the compression
bar 25 and force it towards, and usually against
the surfaceof, the top rollerfl?. Thus, where a
mill choke is impending, the compression bar 29
is caused to operate at a point where it is most
the 3_roller type.
As many changes can be made in the above ap-1
paratus, and many apparently widely different '
embodiments of this invention can be made with
out departing from the scope of the claims, it is
intended thatall matter contained in the above
description or shown in the accompanying draw
ing shall be interpreted as illustrative and notiin
alimiting sense.
What is claimed is:
1. In a sugar cane mill of the type having op
posed upper and lower extraction rollers, a cane
compression memberextending above and trans
versely of the path of feed of the cane towards
In some installationsiit may be found necessary
said rollers, rotatablemeans supporting said, com
to provide some limitation to the outward swing 40 pression member and permitting free swinging
'7 of the rods 25, away from the upper mill roller
movement towards and from said upper roller,
and means for alternately raising and lowering
if! to prevent the compression bar 26 ‘from’ being
thrust into the conveyor which feeds the mill. 'To
limit ‘this outward swing of the connecting rods
said compression membenwhereby'said compres:
7 2 i, there may be provided, for example, across the
distance from said upper roller to compress said
‘conveyor trough, a‘horizontal stop against which
said rods strike when they swing outwardly too
‘ far.
To preventthe connecting rods 2 I from swing;
ing inwardly towards the roller :0 so far as to
cause thercompression bar 20 to comerdown
against said roller ina direction normal to the
roller tangent, and thereby breaking, bending or 7
otherwise damaging the connecting rods‘ZL'the
cranks 22 and/or the crank shaft 23, one'or more
prongs or teeth iii] are connected to the compres
sionrbar Zll desirably near. the foot of each con+
necting rod 2 I. With this construction, when the
sion member comes down upon the feed cane at a
cane, is carried by the cane towards the upper‘ '
roller while said member is in compressive‘ en
gagement with said cane, moves upwardly out of
engagement with said cane when near said upper
roller, and may freely swing back to its original
position away from said upper roller in prepara
tion for its next downward cane compressive
2. In a sugar cane mill of the type having op- v '
posed upper and lower juice extraction rollers, a
cane feeding’ mechanism comprising , a crank
shaft, a crank device on said shaft, a substan
tially horizontal cane compression bar extending
cranks 22 are in position most remote from the
above and transversely of ‘the path of feed or the '
upper roller Hi, the prongs all will strike the roller 60 cane,
and connecting rod means having its upper
surface and check the inward swing of the con
I end carried by and freely suspended from said‘
necting rods 2L The prongs also serve to enter
crank device, and having its lower end connected
the blanket and insure the movement "of the bar
to said bar and freeto swing towards andfrom' 9
283 along with the blanket towards the rollers.
' By means of the construction of the present in? 65 said upper roller during rotation of said crank
vention, the feed blanket or layer is compacted,
. so that a thinner cane blanket results and easier
feed of the blanket towards the mill opening is
effected‘ without prejudice to the juiceextraction.
This compressing and compacting of the feed
' blanket prior to its entry into the'nip region of .
the mill rollers Iii. and I2 prevents mill chokes,
and reduces mill slippage.
_ The, mechanism of the present invention not,
only compresses the/sugar, cane into a more com;
3. In a sugar cane mill of the type having op
posed upper and lower juice extraction rollers, a
cane feeding mechanism comprising a cane com-.
pression bar extending above and transversely of:
'the path'of feed of the'cane towards said rollers,
means freelyv suspending said compression bar for
swinging movement towards and away fromrsaid- 7 ~
upper. roller, stop means‘ connected to said bar. '
and adapted to engage saidupper roller tolimi-t
swinging movement of said bartowards said roll-1
er, and means for alternately moving said com
pression member towards and away from the path
roller, and is then free, to swing away from said
upper roller.
of feed of said cane.
4. In a sugar cane mill of the type having
7. In combination, a wind superposed cane
[crushing rollers, a cane compression member, a
rotatable support for said member and on which
opposed upper and lower juice extraction rollers,
said member is freely suspended, whereby said
,a cane feeding mechanism comprising’ a cane
member may swing back andforth directly above ,
the lower roller and toward and away from said
compression bar extending above and transverse
ly of the path of feed or the cane towards said
rollers, means suspending said compression bar
upper roller during the rotation of said support.
8. The combination with a pair of superposed
for free swinging movement towards and away 10
cane crushing rollers, of means acting intermit
from said upper roller, prongs connected to said
‘ tently on the cane being delivered to said rollers
bar and adapted to enter the cane being fed to
and to compress said cane, said means including
said rollers, and means for alternately moving
said compression bar up and down, and towards - a cane compression member, a member rotatable
and away from the path of feed of said cane.
15 in the same direction as the upper roller and
pivotal connections eccentrically positioned on
5. In a sugar cane mill of the type having op
said rotatable member and freely suspending said
posed upper and lower juice extraction rollers, a
cane feeding mechanism comprising a cane com-v
compression member, whereby during the rota-,
pression bar extending above and transversely of
tion of said rotatable member said compression
the path of feed of the cane towards said rollers, 20 member is raised adjacent to said upper roller
and is then free to swing away from said upper
a rotatable member, means freely suspending said
compression bar from said member for swinging
roller, and is then lowered into engagement with
movement towards and away from said upper
the cane and at a distance from said upper roller,.
and is then carried by the cane towards the up- ‘
roller, whereby said bar is moved in a closed path
and moved towards said roller when in the, lower 25 per roller.
9. An apparatus as de?ned in claim 8, in which
part of its path of movement, and at a speed
there is provided means for rotating saidrotat
controlled by the rate of movement of the cane
able member at a peripheral speed substantially
towards said roller, and the limit of said move
higher than the peripheral speed of said rollers.
ment being eliected by the engagement of said
bar with the upper roller.‘
6. Means for compressing cane being fed be-'
tween upper and lower rollers, said means in
cluding a rotatable crank, a substantially hori
zontal cane compressing member and connecting
means pivotally suspended on said crank and car
rying said bar at the lower end thereof, whereby
during each revolution of said crank said bar is
alternately lowered into engagement with the
cane and is carried thereby towards said roller,
and is raised out of engagement with said cane
when adjacent to and in contact with the upper
10. In a sugar cane mill, the combination of a
pair of superposed rollers, a crank positioned
above said rollers and at the cane intake side
thereof, a cane compression bar and means se
cured to said bar and pivotally suspended on said
crank, whereby said bar is free to swing toward
and from the upper roller, the position and radius
of said crank being such that said bar engages
‘said upper roller and is moved upwardly along
the surface thereof, and may then swing away
from said upper roller before being lowered into
engagement with the cane. 1
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